"It's a trillion tons of ice," as one expert told NPR. Now the largest iceberg in the world, A23a, is on the move after decades of being grounded on the seafloor.

A23a broke off from Antarctica’s Filchner Ice Shelf in 1986, and remained grounded on the seabed in the Weddell Sea for over 30 years before beginning its slow journey north in 2020.

A23a, the world's largest and oldest iceberg, is finally cruising again through icy ocean waters after an unexpected delay. This summer, A23a got stuck near the South Orkney Islands, twirling in ...

A23a started to drift up through the Southern Ocean in 2020, when currents put it on a possible collision course with South Georgia. The iceberg and the island are about the same size in square miles.

A23a, nicknamed the "queen of icebergs," measures 1,222 miles (1,967 kilometers) in surface area, according to the U.S. National Ice Center. It first broke off from Antarctica's Filchner Ice Shelf ...

The iceberg, dubbed A23a, is caught in the churn of a powerful ocean current and revolving slowly, at a rate of around 15 degrees per day, according to the British Antarctic Survey, which shared ...

However, A23a may not hold its size title for long, because as of May 16, it is only around 12 square miles (31 square km) larger than the next-biggest iceberg, D15A, according to the U.S ...

A23a has held the “largest current iceberg” title several times since the 1980s, occasionally being surpassed by larger but shorter-lived icebergs, including A68 in 2017 and A76 in 2021.

A23a megaberg: Game of Thrones style ice wall on course to hit British island. The world’s largest iceberg, stretching from horizon to horizon, is on course to hit South Georgia Island.

NASA image of A23a on November 28, 2023, (main) and stock map of Antarctica (inset). Currently the largest iceberg in the world, A23a is on the move again after being trapped in an ocean current ...

A23a has been embroiled in drama since the start, a trait it picked up from its parent-berg. A23, which was even bigger than A23a, was one of three icebergs that broke off, or calved, from the ...

A23a, nicknamed the "queen of icebergs," measures 1,222 miles (1,967 kilometers) in surface area, according to the U.S. National Ice Center. It first broke off from Antarctica's Filchner Ice Shelf ...